Improvement in adjustable arms for working slide-valves



in'trd gratta page cada HUBBARD ElEbTDRICKSObT, OE RED BANK, NEW JERSEY.

Lam Para: No. 107,492, dated september 2o, 1ero,-

IMPROVEMENT IN ADJSTABLB A RMS roawonxme SLIDE-VALVES.

The Schedule referred to in these Letters Patent andmakng part of the sarde.

To all whom' it may concern:

B e it known that I, HUBBARD HENDmoKsoN, of Red Bank, in the county of.M0nmonth and7 State of New'Jersey, have invented a new and improved Adjustable Arm for Working Slide-Valves, 85e.; and I do hereby declare that the following is a full, clear, and exact Idescription thereof, which will enable others skilled in the art to make and use the same, ret'- erence being had to the accompanying drawing forni'-v ing part of this specification.

Figure l represents a side vi'ew of myimproved adjustable valve-crank.

Figure 2 is a longitudinal section of the same.

- Figure 3 is a transverse section of the same.

Similar -letters of reference indicate 'corresponding parts. l I

My invention relates to slide-valve adjusting arms; and

My ohject is to effect therein certain improvements, which will -be first described in connection with all that is necessary to a full understanding thereof', and .their clearly specified in claim.

Akin the drawing represents the rotating drivingshaft of the engine, carrying the eccentrica, for working the steam-valve.

' B is the rock-shaft, which receives motion from the shaft A, `by means of the eccentric a, connecting-rod Stand crank D, and which, by means of a crank, b,

imparts reciprocating or other suitable motionto the valve E in the steam-chest.

The crank D is provided with stops, the edges of which are arcs of circles struck from theaxis of the rod C, on A.

In this slot is anadjustahle slide, F, carrying a projecting pin, c, to which the end of the rod C is secured.

The slide F contains within its body a swivel-nut, d, which can swing within the slide, while the same is being adjusted in the slot.

A screw, G, fitted lengthwise through the crank D, and through'the nut zZ, as shown in iig. 2, serves to adjust the slide higher or lower within the slot, and with it also thev pin C.

It will be v readily perceived that, by means of the arcmovement of the piu c, the backward the valve-slide is never changed.

Every adjustment `of the pin toward orfrom thc the shaft to be rocked will 'increase or diminish the arcin which said shaft is vibrated, and, consequently, the forward throw of the valve.

` I-f'the piu was adjusted en a radial line from. the rock-shaft B, both the forwardand .backward throw of' the shaft and slide-valve would be equally af'- fected.

The swivel-uut, moving vonvthe straight screw, permits .the slide, which moves in the curved track, to swing on it during the different movements.

The crank D may, instead 'of heilig slotted, as l shown, be provided with a curved'groove or rail for guiding the slide.

A notched or marked.plate,c, maybe secured tov the slide F, to show, by means of a spring or pointer, j, xed to the crank D, the position off-the'pinfc, with reference to its e'ects upon the motion aof the valve.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-y 1. The arc slotted arm D and slide F c, combined with nut ll and straight screw G, as andfor thc purpose described.

2. The slotted arm D and slide F c, combined with notated plate e and pointer f, as and for the purpose described.

' HUBBARD HENDRICKSON.'`

Witnesses v GEoCW. MABEE, T. B. MosHER.

throw 'ot'. I 

